Untitled Document

For this DIY project, we will be creating a dance sensor that can be hooked to a computer. If you have a rasberry pi or an android phone , you could connect this sensor to it and carry it with you.

The project is basically a sensor that is hooked to a shoe, when you dance, it will twitter a status update stating that you're dancing and play a short sound.

STEP 1 - Get your shit together

Arduino Diecimila
Wires
1K Ω resistor
250 Ω resistor
Push button
Shoes
Computer running GNU/Linux

STEP 2 - Connect

Hook up a circuit according to this schematic, PIN 13 and its LED is not mandatory. Both the VCC, GND and PIN 2 are from the Arduino.

when hooked up and done, it should look as such

STEP 3 - get a twitter account

You not only need a twitter

account, you also need to go to the developer section and request API access. this is done by first singing up with twitter.com then going to http://dev.twitter.com and creating a new application. See the pictures below.

Retrieve from the application settings, the following API codes:

consumer_key

consumer_secret

access_token

access_token_secret

STEP 4 - Programming

Replace your API codes with the ones in this Python code and save this code to a text file named "instadance.py"

import datetime
import serial
import twitter
import os

ser = serial.Serial('/dev/ttyUSB0', 9600)

api = twitter.Api("consumer_key", 
		"consumer_seccret", 
		"access_token", 
		"access_token_secret")

counter=0
t0 = datetime.datetime.now()
msg = "I'm Dancing :D"

while 1:
	p = ser.readline()
	counter=counter+1	
	print (datetime.datetime.now()-t0)
	if ((datetime.datetime.now()-t0).seconds) > 30:
		t0 = datetime.datetime.now()
		counter=0
	else:
		counter=counter+1
		if counter==50:
			os.system("aplay bell.wav")
			print "Loading please wait..."
			hour=str(datetime.datetime.now().hour)
			minute=str(datetime.datetime.now().minute)
			api.PostUpdate(msg+" ("+hour+":"+minute+")")
			print msg

STEP 5 - Getting a sound

You need an unformatted wav file, download the following bell.wav (14K) and place it in the same folder as "instadance.py".

STEP 6 - Install Libraries

For the code to work, you need to install two libraries, one for the twitter API and one for the serial port.

The twitter API library installation guide

Download python-twitter-0.8.2.tar.gz (62.2 Kb)

or use this QR-code to scan and download the file

Extract the content of the file to a folder, direct a terminal to it and type in the following command:

you@computer:~$ python setup.py install

For the twitter API itself to work, you have three other dependencies. Visist and install the following three libraries.

http://cheeseshop.python.org/pypi/simplejson

http://code.google.com/p/httplib2/

http://github.com/simplegeo/python-oauth2

The serial port library installation guide

Download pyserial-2.6.tar.gz (113 Kb)

Extract the content of the file to a folder, direct a terminal to it and type in the following command:

you@computer:~$ python setup.py install

STEP 7 - Arduino

Connect your Arduino to your laptop or pc running GNU/Linux and upload the following code to the device

// set pin numbers:
const int buttonPin = 2;
const int ledPin =  13;

// variables will change:
int buttonState = 0; 

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);      
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);     
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {     
    // turn LED on:    
    digitalWrite(ledPin, HIGH);  
  } 
  else {
    // turn LED off:
    digitalWrite(ledPin, LOW); 

  }
}

STEP 8 - The Shoe

Attach the push button to a shoe, this can be done differently depending the type of push button you are using and the amount of love you have for your shoes.

STEP 9 - Try it out

To understand what the pattern for dancing is you need to try it out. Make sure to have the arduino connected to your computer with the USB cord. Run the "instadance.py" code by directing your terminal to the file and typing the following

you@computer:~$ python instadance.py

Here are the following test-data we recieved

6.98184
7.173643
8.15385
8.241606
9.165586
9.23362
10.205625
10.276241
11.249569
11.317582
12.229567
12.297611
13.169597
13.249615
14.141594
14.209798
15.1536
15.213615
16.085618
16.153569
17.033597
17.105527
17.997402
18.057402
18.977585

1.008517
1.068062
1.340072
1.400025
1.680034
1.740081
1.980035
2.032051
2.323795
2.36135
2.632031
2.683898
2.952042
3.004751
3.283833
3.333152
3.604032
3.644022
3.924005
3.964415
4.253245
4.304062
4.584036
4.624146
4.909567

0.258927
0.326955
0.710992
0.772081
1.44266
1.490909
1.818936
1.872711
2.270864
2.331092
3.043039
3.08289
3.414647
3.442887
3.794751
3.834866
4.543797
4.586889
4.903928
4.946783
5.288098
5.335065
5.966894
5.995035
6.327148

STEP 10 - Choose a dance

The python code provided is just 50 steps / 30s, you need to choose a dance-style and modify the code with an algorithm that recognizes the pattern. When that is done you're good to go.

HERE'S OUR DANCE UPDATER

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